Just downloaded the latest 360 Dashboard update that was released today. (UK Pal). I now cannot connect to my Airport Extreme using 802.11a. I am using the offical XBOX 360 Wireless Network Adapter and my Airport is in 802.11a/n mode. Tried WEP and WPA but the network just does not show up. However, it works with no security enabled. So for now will just use MAC Address authorisation. Have posted this to the Technical Forum at xbox.com but waiting moderator approval. Can Anyone else confirm they are having this problem?